Remmers had been with the Rams practice squad, while Lester was on Carolina's practice squad.
The 6-foot-5, 300-pound Remmers spent time on practice squads in Tampa Bay, Minnesota and St. Louis. He played one game for the Chargers in 2013, and entered the NFL in 2012 as an undrafted free agent from Oregon State.
Blackburn played in six games this season, started two and has 11 tackles.
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